FUEL SUPPLY DEVICE FOR ENGINE

PROBLEM TO BE SOLVED: To avoid rise of temperature in a fuel tank by regulating return fuel at minimum while avoiding gasification of fuel without rise of cost in a fuel supply device for an engine changing over liquefied gas fuel supply method between a return type and a return-less type. SOLUTION: A first fuel return line 9a branching off on the way of a fuel supply line, and a second fuel return line 9b returning fuel not injected by an injector 8 are connected to a fuel tank 2 with including pressure regulators 14, 15. Liquefied gas fuel supply method is controlled by return-less type by establishing setting pressure of pressure regulator 15 higher than that of pressure regulator 14 and opening a cut off valve 12 of the first fuel return line 9a. A fuel pressure sensor 52 and a fuel temperature sensor 51 are provided at a position near a fuel rail 6. When electronic control unit 50 detecting signals thereof determine that there is possibility of gasification of injected fuel, liquefied gas fuel supply method is controlled by return type at a time of engine start and by return-less type at a time of regular operation. COPYRIGHT: (C)2007,JPO&INPIT